/*
 * Copyright (C) 2008 Shane Isbell
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.slideme.atom.parser;

import org.kxml2.io.KXmlParser;
import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;
import java.io.InputStream;

public class ParserUtils {


    public static KXmlParser createParserFrom(InputStream inputStream) throws IOException, XmlPullParserException {
        if (inputStream == null) {
            throw new IllegalArgumentException("inputStream");
        }

        KXmlParser parser = new KXmlParser();
        
        try {
            parser.setInput(inputStream, null);
        } catch (XmlPullParserException e) {
            throw new IOException(e.toString());
        }
        
        return parser;
    }

     public static String getMimeTypeForTag(KXmlParser parser) throws IOException {
        int attributeCount = parser.getAttributeCount();
        String type = null;
        if (attributeCount == 0) {
            type = "text";
        } else if (attributeCount == 1) {
            type = parser.getAttributeValue(0);
        } else if (attributeCount > 1) {
            throw new IOException("Too many attributes found: Number = " + attributeCount);
        }
        return type;
    }

    public static String getAttributeByName(String name, KXmlParser parser) {
        int attributeCount = parser.getAttributeCount();
        for (int i = 0; i < attributeCount; i++) {
            if (name.equals(parser.getAttributeName(i))) {
                return parser.getAttributeValue(i);
            }
        }
        return null;
    }
}
